EFFECT OF THE DIFFERENCE IN SOUND WAVE-BASED ATTRACTOR FREQUENCY ON THE CATCH OF HALFBEAK FISH (OXYPOHAMPHUS MICROPTERUS) USING TRAMMEL NET AT SURABAYA COAST

The purpose of this study was to determine the effect of differences in frequency of sound wave-based attractors on the catch of halfbeak fish (oxyporhamphusmicropterus) on a three-layer trammel net on the Surabaya coast. In this study the frequency difference treatment of sound wave based attractors with a range of 500-1000 Hz mounted on a three layer gill net (trammel net). The material used is sound wave-based attractors totaling 6 pieces with different frequencies such as 500 Hz, 600 Hz, 700 Hz, 800 Hz, 900 Hz and 1000 Hz. The effect of the different frequencies used on sound wave based attractor on the catch of halfbeak fish (oxyporhamphusmicropterus) with a three-layer trammel net on the Surabaya coast obtained significant or significantly different results. The frequencies of 800 Hz, 900 Hz and 700 Hz are frequencies that get a higher response compared to frequencies of 500 Hz, 600 Hz and 1000 Hz. The results of the analysis using the Duncan test, obtained results that the frequency of 800 Hz is the frequency that produces the highest average value. The distribution of the number of catches of halfbeak fish (Oxyporhamphusmicropterus) using sound wave-based attractors in a three-layer net, obtained the highest value at the 800 Hz frequency of 12.7 kg (34.3%), followed by a 700 Hz frequency of 8.8 kg (23.7%) and a frequency of 900 Hz of 6.0 kg (16.3%).